SSRS: SQL Function for handling multiple value parameter

CREATE FUNCTION dbo.fn_MVParam(@RepParam nvarchar(4000), @Delim char(1)= ',')RETURNS @Values TABLE (Param nvarchar(4000)) AS
BEGIN
DECLARE @chrind INT
DECLARE @Piece nvarchar(4000)
SELECT @chrind = 1
WHILE @chrind > 0
BEGIN
SELECT @chrind = CHARINDEX(@Delim,@RepParam)
IF @chrind > 0
SELECT @Piece = LEFT(@RepParam,@chrind - 1)
ELSE
SELECT @Piece = @RepParam
INSERT @Values(Param) VALUES(@Piece)
SELECT @RepParam = RIGHT(@RepParam,LEN(@RepParam) - @chrind)
IF LEN(@RepParam) = 0 BREAK
END
RETURN
END

For reference

From "Pro Sql Server 2008 Reporting Services"- APress